LEXUS GS400 2000 Service Repair Manual

SF0NG±04
B02000
New Gasket
(Large)
(Small)
New Gasket
B01582
B09504
± SFI (2JZ±GE)FUEL PRESSURE PULSATION DAMPER
SF±27
1493 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
1. INSTALL FUEL PRESSURE PULSATION DAMPER
(a) Install the fuel inlet pipe and pulsation damper with 2 new
gaskets.
HINT:
Different the gaskets are used for the upper (large side) and
lower (small side).
(b) Using SST, tighten the pulsation damper.
SST 09612 ± 24014 (09617 ± 24011)
Torque: 32.5 N´m (325 kgf´cm, 24 ft´lbf)
(c) Install the bolt holding the fuel inlet pipe to the intake man-
ifold.
Torque: 9.0 N´m (90 kgf´cm, 80 in.´lbf)
(d) Install the nut holding the No. 2 vacuum pipe to the intake
manifold.
Torque: 21 N´m (210 kgf´cm, 15 ft´lbf)
2. CONNECT CONNECTOR AND HOSES
(a) Connect the vacuum hose (from No.2 vacuum pipe) to the
air intake chamber.
(b) Connect the EVAP hose to the EVAP pipe.
(c) Connect the VSV connector for the EVAP.
3. INSTALL ENGINE COVER
Install the engine cover with the 4 nuts.

SF0NH±02
A07216
Location of Fuel Tank Cushion
Fuel Sender
Gauge
EVAP Hose
Hose ClampFuel Inlet Pipe Fuel Tank Cap
Shield
Ring
1.5 (15, 13 in.´lbf)
Fuel Inlet Hose
Fuel
Hose
 Gasket
3.5 (36, 31 in.´lbf)
 Gasket
Fuel Sub±Suction Hose
Fuel Tank
x 5
x 8
Fuel Tank
Vent Tube
Set Plate
Tube Joint
Clip
Fuel Pump
and Sender
Gauge
Assembly
Fuel Tank Main Tube
Fuel Tank Band
N´m (kgf´cm, ft´lbf) : Specified torque
 Non±reusable part
39 (400, 29)
SF±28
± SFI (2JZ±GE)FUEL TANK AND LINE
1494 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
FUEL TANK AND LINE
COMPONENTS
CAUTION:

Always use new gaskets when replacing the fuel tank or component parts.

Apply the proper torque to all parts tightened

SF0NI±03
BO0919
Crack Leakage
Deformation
Z10162
SSTUse SST
30 N´m
(310 kgf´cm, 22 ft´lbf)
Fulcrum
Length
30 cm
(11.81 in.)
SST: 09631±22020
FU0041
PipeHose
Clip 2 ± 7 mm (0.08 ± 0.28 in.)
0 ± 3 mm (0 ± 0.12 in.)
± SFI (2JZ±GE)FUEL TANK AND LINE
SF±29
1495 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
INSPECT FUEL TANK AND LINE
(a) Check the fuel lines for cracks or leakage, and all connec-
tions for deformation.
(b) Check the fuel tank vapor vent system hoses and connec-
tions for looseness, sharp bends or damage.
(c) Check the fuel tank for deformation, cracks, fuel leakage
or tank band looseness.
(d) Check the filler neck for damage or fuel leakage.
(e) Hose and pipe connections are as shown in the illustra-
tion.
If a problem is found, repair or replace the parts as necessary.

SF0NJ±04
B08971
MAF Meter Connector MAF Meter Stay
Gasket
SF±30
± SFI (2JZ±GE)MASS AIR FLOW (MAF) METER
1496 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
MASS AIR FLOW (MAF) METER
COMPONENTS

SF0NK±03
B01956
B01856
OhmmeterTHA
E2E2
B01857
VoltmeterE2G
VG
Air
± SFI (2JZ±GE)MASS AIR FLOW (MAF) METER
SF±31
1497 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSPECTION
1. REMOVE MAF METER
(a) Disconnect the MAF meter connector.
(b) Remove the 2 bolts, MAF meter, gasket and stay.
2. INSPECT MAF METER RESISTANCE
Using an ohmmeter, measure the resistance between terminals
THA and E2.
TerminalsResistanceTemperature
THA±E213.6 ± 18.4 kW±20°C (±4°F)
THA±E22.21 ± 2.69 kW20°C (68°F)
THA±E20.493 ± 0.667 kW60°C (140°F)
If the resistance is not as specified, replace the MAF meter.
3. INSPECT MAF METER OPERATION
(a) Connect the MAF meter connector.
(b) Connect the negative (±) terminal cable to the battery.
(c) Turn the ignition switch ON.
(d) Using a voltmeter, connect the positive (+) tester probe to
terminal VG, and negative (±) tester probe to terminal
E2G.
(e) Blow air into the MAF meter, and check that the voltage
fluctuates.
If operation is not as specified, replace the MAF meter.
(f) Turn the ignition switch OFF.
(g) Disconnect the negative (±) terminal cable from the bat-
tery.
(h) Disconnect the MAF meter connector.
4. REINSTALL MAF METER
(a) Install the gasket to the MAF meter.
(b) Install the MAF meter with the 2 bolts and stay.
Torque: 10.7 N´m (109 kgf´cm 8 ft´lbf)
(c) Connect the MAF meter connector.

SF0NL±05
B09506
B01608
B01982
LEXUS
Hand±Held
Tester SF±32
± SFI (2JZ±GE)THROTTLE BODY
1498 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
THROTTLE BODY
ON±VEHICLE INSPECTION
1. REMOVE ENGINE COVER
Remove the 4 nuts and engine cover.
2. INSPECT SYSTEM OPERATION
(a) Check that the throttle linkage moves smoothly.
(b) Inspect the throttle control motor for operating sound.
(1) Turn the ignition switch ON.
(2) When turning the accelerator pedal position sensor
lever, check the running sound of the motor. Also,
check that there is no friction sound.
If operation is not as specified, check the throttle control motor,
wiring and ECM.
(c) Inspect the throttle position sensor and accelerator pedal
position sensor function.
(1) Connect the LEXUS hand±held tester to the DLC3.
(2) When turning the accelerator pedal position sensor
lever to the full±open position, check that the
throttle valve opening percentage (THROTTLE
POS) of the CURRENT DATA showns the standard
value.
Throttle valve opening percentage: 60 % or more
If operation is not as specified, check that the throttle position
sensor, accelerator pedal position sensor, wiring and ECM.
(d) Start the engine, and check that the Malfunction Indicator
Lamp (MIL) does not light up.
(e) Inspect the air assist system.
(1) Allow the engine to warm up to normal operating
temperature.

B09507
B01620
Ohmmeter3 (CL±)
4 (CL+)
1 (M+)
2 (M±)
B01942VCOhmmeter
E2
B01943
VC Ohmmeter
E2
± SFI (2JZ±GE)THROTTLE BODY
SF±33
1499 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(2) Turn the A/C switch ON and OFF, and check the idle
speed.
Idle speed (Transmission in neutral):
700 ± 50 rpm (A/C OFF)
750 ± 50 rpm (A/C ON)
NOTICE:
Perform inspection under condition without electrical load.
(3) With engine idling, pinch the air assist hose and
check that engine speed drops, and then returns
back up to idle speed.
If operation is not as specified, check the throttle body, wiring
and ECM.
(f) After checking the above (b) to (e), perform the diving test
and check that there is no sense of incongruity.
3. INSPECT THROTTLE CONTROL MOTOR
(a) Disconnect the throttle control motor connector.
(b) Using an ohmmeter, measure the resistance between ter-
minal 3 (CL±) and 4 (CL+).
Resistance: 4.2 ± 5.2 W at 20°C (68°F)
(c) Using an ohmmeter, measure the resistance between ter-
minal 1 (M+) and 2 (M±).
Resistance: 0.3 ± 100 W at 20°C (68°F)
If the resistance is not as specified, replace the throttle control
motor. (See page SF±37)
(d) Reconnect the throttle control motor connector.
4. INSPECT THROTTLE POSITION SENSOR
(a) Disconnect the throttle position sensor connector.
(b) Using an ohmmeter, measure the resistance between ter-
minals VC and E2.
Resistance: 1.2 ± 3.2 kW at 20°C (68°F)
If the resistance is not as specified, replace the throttle position
sensor. (See page SF±37)
(c) Reconnect the throttle position sensor connector.
5. INSPECT ACCELERATOR PEDAL POSITION SEN-
SOR
(a) Disconnect the accelerator pedal position sensor con-
nector.
(b) Using an ohmmeter, measure the resistance between ter-
minals VC and E2.
Resistance: 1.2 ± 3.2 kW at 20°C (68°F)
If the resistance is not as specified, replace the accelerator ped-
al position sensor. (See page SF±37)

SF±34
± SFI (2JZ±GE)THROTTLE BODY
1500 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(c) Reconnect the accelerator pedal position sensor connec-
tor.
6. REINSTALL ENGINE COVER
Reinstall the engine cover with the 4 nuts.

SF0NM±07
B09000
Intake Air Resonator
PCV Hose
PS Air Hose
Throttle Control
Motor ConnectorThrottle Body Bracket
Throttle Position Sensor Connector
Water Bypass HoseWater Bypass Hose Engine Wire ClampAccelerator Pedal Position
Sensor Connector
Accelerator Cable
21 (210, 15)
N´m (kgf´cm, ft´lbf) : Specified torqueThrottle Body
Engine Cover
B01947
CoverAccelerator Pedal Position Sensor
Washer Plate
Throttle Control Motor
Throttle Position Sensor Bracket
x 5
± SFI (2JZ±GE)THROTTLE BODY
SF±35
1501 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
COMPONENTS

SF0NN±05
B01615
B01616
Forward
Down±Side
Diagonal(2) (1)
SF±36
± SFI (2JZ±GE)THROTTLE BODY
1502 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. DRAIN ENGINE COOLANT
2. REMOVE ENGINE COVER
Remove the 4 nuts and engine cover.
3. REMOVE INTAKE AIR RESONATOR
4. REMOVE THROTTLE BODY BRACKET AND
THROTTLE BODY
(a) Disconnect the accelerator cable.
(b) Disconnect the throttle position sensor connector.
(c) Disconnect the throttle control motor connector.
(d) Disconnect the accelerator pedal position sensor con-
nector.
(e) Disconnect the engine wire clamp from the clamp bracket
of throttle body.
(f) Remove the 2 bolts and nut holding the throttle body to
the intake air connector.
Torque: 21 N´m (210 kgf´cm, 15 ft´lbf)
(g) Remove the 4 nuts and throttle body bracket.
Torque: 21 N´m (210 kgf´cm, 15 ft´lbf)
(h) Slightly slide the throttle body away from the intake air
connector.
NOTICE:
When putting up the throttle body, do not hold the motor
part.
(i) Disconnect the 2 water bypass hoses from the throttle
body, and remove the throttle body.
HINT:

At the time of installation, please refer to the following
items.

Connect the water bypass hose with its discrimination
mark downward.

Install the with its craw direction for (1) forward and down±
side diagonal (engine side about 45°) for (2).